单项选择题
A.VC=Vh/[1-(ph-Pc)F] B.VC=Vh/(ph-Pc)F C.VC=Vh/(pc-ph)F D.VC=VhF/(ph-Pc)
A.q与X3成正比 B.q与X2成正比 C.q与X2成反比 D.q与X3成反比
A.正比 B.平方正比 C.反比 D.不确定